I went to Gander Mtn. this morning and they have 25" and 26" ITP Mudlites. The 26" lugs are MUCH deeper and longer than the 25" tires which surprised me. I'm interested in your feedback if the 400 will be able to turn the 26" tires without having to re-jet or upgrade the exhaust. I've read numerous posts suggesting to re-jet etc. if you increase the tires, but I don't want to void the warranty. I'm guessing since the increase in tire size is only 1", may not be a big deal or impact to performance. Also, if I went to the 26" tires, can I use the stock rims which are 25x10x12? I know nothing about the tire/rim size or what these number really mean. Appreciate your comments.